System crashing, Freezing and locking up!!!!

i have a P3 800MHz 133, QDI Advance9 MotherBoard, 128MB 133 , Creative GeForce2 GTS
When systems boots it has a habit of locking up and Explorer not responding, rebooting was the only answer!!, OpenGLSetup will not install, Saying (UNKNOWN DISPLAY DEVICE ) and OpenGL is not on OpenGL setup for my Display Device, all games lock up , Deus Dx, Unreal Tournament, Startrek Elite Force, all lock up at random with the only option to reset!
Im using Detonator 3 Drivers for my GeForce2 - 'PLEASE HELP'